Understanding the Transient Behavior of Organic Electrochemical Transistors

Their ability to operate at low voltages and in aqueous media makes Organic Electrochemical Transistors (OECT) highly promising for bio-electronic applications. Their maximum switching frequency is a deciding factor for some of the applications targeted by OECTs. A thorough understanding of the transient behavior of OECTs and a detailed formulation of design rules for high speed OECTs are therefore essential for a widespread application of this technology.

Here, we extend our 2D model [1] used previously to study the steady state and scaling laws of OECTs [2,3], to include transient effects. Various factors influencing their transient response are studied experimentally and the observed trends are explained with the new 2D model. Based on this analysis, key factors for increasing the speed of OECTs are put forward, leading not only to an improved performance of OECTs, but as well to a better understanding of the physics of OECTs technology.

References

[1] V. Kaphle, P. R. Paudel, D. Dahal, R. K. Radha Krishnan, and B. Lüssem, Nat. Commun. 11, 2515 (2020).

[2] P. R. Paudel, V. Kaphle, D. Dahal, R. K. Radha Krishnan, and B. Lüssem, Adv. Funct. Mater. 31, 2004939 (2021).

[3] P. R. Paudel, J. Tropp, V. Kaphle, J. D. Azoulay and B. Lüssem, J. Mater. Chem. C  9, 9761-9790 (2021).